Excellent views of a U.S. Navy HO3S-1A helicopter. (This is the U.S. Navy version of the Sikorsky S-51, also known as an H-5). This particular helicopter is one of the first four Sikorsky S-51 helicopters ordered by the U.S. Navy in 1946 for use in Operation High Jump operations in Antarctica. The helicopter on the ship deck in the Pacific Ocean . U.S. Navy Lieutenant Tracy gets onto the helicopter. The helicopter takes off from the ship deck. The navy helicopter comes back in for a landing. Lieutenant Tracy gets off the helicopter and crew members secure it on the flight deck.